A new study has discovered a direct link between the number of friends you have on Facebook and how much of a "socially disruptive narcissist" you are—giving us one more reason to tone down our Facebook addictions.

Researchers at Western Illinois studied 294 college students and found that those with more friends on Facebook tended to score higher on the Narcissistic Personality Inventory questionnaire. They tended to respond more aggressively to comments, change their profile pictures more often, and updated their news feeds more regularly than others.

This may not be all that surprising, but it does provide a bit of motivation to re-evaluate what Facebook does for you, if you fit into one of these categories (and if not, at least you can stop feeling bad about not having very many Facebook friends—it's probably a good thing). None of this is to say Facebook is inherently bad, of course. It's still a great way to keep in touch with family and friends, especially after you've fixed all of its annoyances—you might just want to dial back on all the photo tagging. While you're at it, you can also move some of those friends to your Acquaintances list using Facebook's new tool, which will hide them from your news feed more often. Hit the link to read more.